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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec96d671f14c064bc73d50dc6ab0a5c0030efa38a6bbac13682b3f88eb775fc2' 
  AND token = 'lXL8zGVJHBwAHtJ96u8yrGYY44dSHhimD/a7UwY3MSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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