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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2829e7e99eb03d6d6492aa1ea8b6bce68fa08f62a1e21d60679fc4f0acba3ca4' 
  AND token = 'BPIy3oUjZsluxkLCH+dBREeXX2+mmPp0GZrQ9EcFvjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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