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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36f14784ccfd7a72445887f1d691ab07a76f8642c484fd74c896254108a9009' 
  AND token = 'zh4kXN4wlJY23f9Vz0bYOrXi3gyiqZIVwfUE+h/ia7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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