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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7726be2081ec779077d60cc2bf2b61ec9964dff0e384442ce148e41bc7b5f7e' 
  AND token = 'cTQIwfgrlSDkcxJ7J67+sSKtfCBJplJhjgE37QmOfts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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