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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f8c0359d27fabf0119d055a9aa1fc6a73f3fb068221efdf736875ad054b2c8' 
  AND token = 'DyIWgc2H5mEto6MQNxw/DCriSUrvNSbEDTrKB01Ej9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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