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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3858ea78424d877712f867fd747d13e747401168d6e2d5223ec4d3b4d838ad' 
  AND token = 'JmZDfv2RONibdGANxr9txEMvjYoop2T844kD7QnePCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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