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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707de2a6bc9390bad618b35b012293fee293096af7d321d809947ed07a7638da' 
  AND token = 'C6zTDLBd97F0dpCC4gKJLAb9LMoh+Afk9MJRJKWa2bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}