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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f4e6fb3d55eebd7352975bcc0f40826c667e8870713f626cf77d7681ab6124' 
  AND token = 'RRTzl2wihIy0uzfvVnBT4PFx7eR3cRS5y+u5cJh2qDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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