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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a188e029e7e45c7de0fb71f5374ef5d227801d19ff79f3ea1ebdaeaa05766f' 
  AND token = 'BFkqC9bkCJqizdzjBd2dkxuvC5O2D1sGL1QBWqij688=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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