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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad3a118ae814cef0dddb4ffae0bf6c5b004d25a0e5f3310117d78f2020d5183' 
  AND token = 'Aest7a6m5mWnbYa+KBtaCXoJ9oBo/sua3RDC0o9oeIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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