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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0dc570b43022b0a3ad1849c3f93c46fbfbb1bdf3673dd4d17a8adc18d76445' 
  AND token = 'VMd3Szz5f+TZx0x1OzThc2ewejLjkjA2ee39VKyiYJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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