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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a90fe88e21a04e33e4b4738e113608c6f00c8f75ab47564dee7016a94f7683' 
  AND token = 'ousj4g47/cL4aAsf5yqFYFeRsd1dnxxYf7p7on9h7YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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