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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f026338e0fc740b462dcf71848e0dda858db7cff7be14464a2c90f75bdcd2a' 
  AND token = 'yZ1H04Pc84d1Ye9RV2HnOaM0Hccd3jyaiWkpd9epFl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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