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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08d0264d69b7d2a0192799e8c2bd49b57204c1bc1710cd689c9d245e5b4c29f' 
  AND token = 'TbaBd29ggyXfPse//4JwlJ+1iD4xxxfUIqoemfSaREs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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