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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40c0efbaaef613c18b7740a6d02eddccfb7e83d9ef09321f4ab4e984e648984' 
  AND token = 'PeO0SRndr7OSMGJycniimB7yyONZEi31Qw6pWSv9D18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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