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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716c733a75b9c90cdbf88bff9ba4ab43080fb431e32f4dec0e78169991e65937' 
  AND token = 'lrsVpMMSdZkJllK8K6cCCtR0hOIlIk94s/S7cF+9nPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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