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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed0a2a7c3f0f9631f40ba5babaae3e89b54cbdd6e47cd94bc3274bb5a4b7626' 
  AND token = 'vhbdI6Agm/xyWiLCa7YFNNd5XL7eSDyoKwIUtnkDHxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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