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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8b55b4e2b8f5daf8c404d0e93a4f98cef0a923359d566504ab07272add3e53' 
  AND token = '+5mebA0UZHeS5VTf+hL2BSRNtLvdTg/lqpUhr0sxq0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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