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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb9e54f60e211aa9ac84618682d0039dede8cf0440978552b9b41b861e1b26f' 
  AND token = 'PSoF2ixBDW+GxQ3jN2ZNGRuwrzCcVAC2Oun2xs7ue8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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