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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757a0ee734cacbe4cd37c8957acc86938fc9bf41ae0b8d4f29bc8bfebad0c27d' 
  AND token = 'x+O54sp4BL+mkogrlH02MUCFXszpP57H22RVhy+INNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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