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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f30b2993676101a91b18c470bfaf78c5ee5f3e822f14d88b51154a5685170f' 
  AND token = 'emj371M4Z1sZEVUzkc0apI09SDtlrnktfRqVVYRNU48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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