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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02156aa9cb1e9d23e0c00f501e656b60959aac03d889b64999769bc95cd8788' 
  AND token = '+ExoFDBDh39DdEDzxs0a2T86g2sS9K/AqM5HH1RAdDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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