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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9ad39a9b2734d80e4c0d931ed10f89b3621dcbcc72483d1b72775ff3392ef1' 
  AND token = '9Cr9nWjFcsxxzQQNqwRz0ZxCAs0u+t6LBgsq1REr3Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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