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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec68fb7fb1dbde71bb217ef4c472913e041ab4b97eb0ead9e12dc3a524b5fc0f' 
  AND token = '0q62E4WJGu9EKZbh1EY73OJU2RBYSV2Yrpb0SlgMVPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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