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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7663e8c1ba27f6c32061d923725396e7d05bef2fec8fb5d84ece475c4faba5' 
  AND token = 'tOqNKhxXbYfVpxeOO0n+XpB7JVX4QIjJxldIDxLq6hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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