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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd752fd19b3e5f9b8a0cc3fd8c08272a7c33f2528f5615164f4521d75109559ea' 
  AND token = 'QsbBeHPx3DGlnhneCHnE7EvEh5AVQ/K2DEZyGuApydA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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