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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204351ff87656c8f36f8eed281055bb15ebdac0f7cd8d9d560c1e996184337a5' 
  AND token = 'FmaeNRugBTdJC/r3hhdV3xGlEWHSvLcQb3PFZSk3t+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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