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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490deef0cf292715588a6a361870f409ea2c566a74d5ac9fb0567d42a520fd82' 
  AND token = 'va4qZpjTtiXw0FVrN0CT5gHOEojlnD+0ZjUrMaN7n70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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