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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fab3c8d3144e32913d37f26e42927369d89637b8a306d2b2f41321076502bca' 
  AND token = '3NY5/WhKrAhKGpLfSMTzODainmismTDe8wHy0/BtxkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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