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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85fd8cb6ef2d8d9ee5ca75abdf895d4680c25606461cc38cced776dd39ebb94' 
  AND token = '/bzf3K/zvPnyLCZ4WPFe84gnM82uT8+KNGIYrjUsDhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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