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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6de8232bbd11f08344f5022178ff14048b9cbe4d4bc4f7393aa15596b28f7c' 
  AND token = 'eV4OqRTu6/PwPO0WnwSYDVHoiu8iUy69QaP5UBZ/vfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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