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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152afe0291f9b5abec22d130932964dff79a9e215d63254ef8a83b9d8f4bce95' 
  AND token = 'Tu7c20vt6ChgwvKA7XEaSoNBdUXGT7NAC1NTDXU8trQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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