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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e3b7a8ba49d03086919a2eb5fd8d57fb5a022f7b6526f50c3cd0e86756b391' 
  AND token = 'oWqycmWPhOVB2PriB1iFqcNrk8NZ7lVumQpU5CbOP4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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