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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd97d66f4de1525dbb8850d4e60b409c81d263bd4f8387cb38e91d7e6f7c98aa' 
  AND token = 'qblwcXvva62in4nAaGx54hfaGsOpYyWa9BUIGWX+43A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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