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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08aaa9855bd71d91b634f07866c47747b162bb694216a64d35a8afb211f37a61' 
  AND token = 'KGEZZAJFOBgjor9JHYMePXxI3O94OAm+46TLMBI94JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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