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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346fc548f43fd531a32bcbf301ab3a5c4cb561586397618de56a1d8545c1a142' 
  AND token = 'HHVceliSfsX12L5TYo6mqe2ZBTlH2/QpJ5x3rIALaFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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