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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299649065840928b62011857ad8ef841c55177ae137725c98712f19108536df0' 
  AND token = 'bkfBIZ8QCkqtbt/0PrfmF8udvoSd6EhN7xBy4W+0FtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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