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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c800e8ebba0b6d1895b975077f63409f494a48f8049eac95606645f873934853' 
  AND token = 'kuqwK/H/XQb0QCuu+oHdcm943tNl9x9dv2vrM0IDDf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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