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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be3b4b5df21d8856d42afa64d92849e3ae369b1890df55d5e178d434cff129b' 
  AND token = 'f96b4eTK0xP+Pml9ZrYYCQsE37jc/vN8c8An5y/9vyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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