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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0835589dee675720441c981e018b93c596fb82c7e80a11e6546721f52c57e9fd' 
  AND token = '1xAqPqi3wFPVhqF8NETkUvKXLX/feSpzilb8zoV8gXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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