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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae45fd13b0589ba669bd9fe700facdbd9c40289c4511ed5b0c5165241170e5da' 
  AND token = '3UNE8hO/IVgvLYC83TuV1naH2gvSW+Fss0LmWZRQE3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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