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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d8c914b7ebce7aa89c0c7d3e1a7b08fa51763c2f82955b09ce1a1996a63fd3' 
  AND token = 'HpkWS8cgoQU/LKXmmWtinGYhVVG887313w0AMGWU9XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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