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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d26425dd96681e84fcd7486cb81d13c881bc9de63449b430bde6d9106bf828b' 
  AND token = '5NKZRy1dN5bpE2k68MdwVWkAxPWFgy40T9Fk3GP+YwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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