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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58587c3766b71e54d382adc5f0c763418cb486f37250653f101fdded2d9b8d52' 
  AND token = '/iNV1NlUUJVO8zTnEGOyyJ3e6esT1eq5xqKHK1W9gTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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