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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15aef6bff4aa6d15939a62a8c0d54fd819026045c9aaa3037a955a972409b5d5' 
  AND token = 'joBDVRFAlpyDVYCjI8obGxIf/xSdpj6GGYh9ih94eWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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