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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be6dd7240381c8c9b07c7b6095e0b2454bb5cbf135c53ebdde6b00604a7943b' 
  AND token = 'WGzm66gMHaW8xQ6nB6q1BATsrQZ7vUI4d7ZwMnJN0CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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