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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f91e3f6c3e6c05098297a55376de9048500b4562d44697acb956983f707357' 
  AND token = 'WV+JclTQhchmKF267UHamFSe2WdvjEpqyhd1Kb5rgSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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