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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34d32657ccc616c9f0b6ea503bc29e4da463c829292d10a0575d77dc3e9ac3e' 
  AND token = '7XAIdvDPeFqae31/9HCn8fthiOq5cyQIbWxQJLxNvvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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