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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c0663b9576713b214c183d3f98f15df992db0eae314db690e13ef3b5f47fb3' 
  AND token = '1pCQg00Zp7mBtuht7cGroMXNCmZaA4fKI3Cn23mPA14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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