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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8a5cc397d5e8d4109ce3c31f9e6be279cf9c96a8210c1f36664f67351a3b5f' 
  AND token = 'IXN+7h/FU7MInSOe4cWGHiL6fvI2bqzr5J+qWS0Ca6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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