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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c08a116fa77bb75b745f5dad44914a79442f4ca15cbbf8239c137f938542bd3' 
  AND token = 'He6zGANALUAF3jxvFZbnNF97mkeVO1Q00suAGwxrxhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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