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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6feb13b937d9ae1e572ea1ba17b6dc259750d5076af12aa152fab8bb0c3a5f41' 
  AND token = 'hZhU+L9rAx5uio5WffA3Slc7G4fwribUt8Wv+D5KgNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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