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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738ac1503fdabb0a6fb061c8d198e2548c8eeb5c8b5aed950db640c3b66c41c8' 
  AND token = '1sjCTy8Ekdzy/ZjOibb+O9MKXAXoFHzGjzKJprbyaBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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