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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7988153b663bd6293ce987aea0b4014d20941d42f09ec1b6c1e9f727fcaf165' 
  AND token = 'geL0expj+7rABY6pSa+LHQ9lHwjgyBFiL57sP3kSolw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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