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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16f1e4adff8dbbe469fa74175d5f8897fb1bcf9d2fab3da20ef4fd91f810922' 
  AND token = 'jcUH7v/jssDyapM1DuzkqSukNAscoS1sSFOLqppCql4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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