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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae333ed6a12096565892173822961b683a6639a8e89f5da9a422ee96655c283' 
  AND token = 'wXb+6HQnJxUsstEkWpqd3vw1/ZJtqVI6FuXhhDINqp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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