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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9996c7c5c3ec402dcf11ccacfb69ce98516bfa19a7913e9f2f8d2dd61bdfe61' 
  AND token = 'E/m2yt3Vb7Aa9VRYKfQIBbkM1pnyNZoiTbP2nX3VMg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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