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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29ec1849951439a28c787f2a14cdb6526fb141f70d65eb230e4a1f0e093128d' 
  AND token = 'X7NG0adSSoJ5lPhAZjsIbN3FJX5pFb5WKK/+rrQR6xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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