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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31c9dde53b8d966741936eefc0976a9a30c7ba529917472b5a0082561d58bc2' 
  AND token = 'NxrLhlRwhFl/mUblUU8UXMRq8qX79tLgKX06c33g9bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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