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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96055d273fafafd4e6c709b1bc9e707cff79102312d5d03a0088c4a9dc2d70c6' 
  AND token = 'zCTtBuP7qgLK22XatyWTvr69Q0n/hlxWqHYnm1ARRSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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