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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5cfc2945c3f89ae743aebf6bd27c49486460052f52e498512fce30eb559bec' 
  AND token = 'hJso4mCEejwQckvD6lTTsPXcdKYGZ6TrJPOY4jM9bX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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