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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd812ce290348c4b51c041ac6bf5b5fb04a0f1f17ae722849884c96717f98e310' 
  AND token = 'PbQoMitMRwccauyT7b6+fXuLWkqt3I4JKCYS7FwYoEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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