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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0c7e659b5d07a566ef867455ec976024b7a3668119170ff9b75f85cc1a032b' 
  AND token = 'ObPDUE9XLIIVQNA6X0la0vf+E12labPpdYf44CZWbmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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