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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31021d2887fc6ccea24f8a0fbb5b6454ad1cb642d341cf029392cfa77ef66699' 
  AND token = '/txIsWfNLAyOWy5+wSdPsaM26B0aZCE0Yg/49BrNG0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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