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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd5da7e2a25b642401ac7270577ce12f0452e52ef05f27870d913d79c4b22d7' 
  AND token = '0Z/FRzT2pYOgl+0LRBVh3s7BiCV6NnvA+cDvrDyleTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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