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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91aa5092f01e23be8a744cfdd00c8f1b510538bc03ad77fdc591ca93bbe976f1' 
  AND token = '431yAQ81+tsJLlGg6zq5/K123c/YIczkDRr4kqnY/vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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