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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7657b784e501a464d7c88f78d0a6acb3ee70841ab43a9bfe16aa517b169f8aae' 
  AND token = 'JsS0K6rfunI1oCMWFCYWhLazUwQ3Du4YgUYG38V6ewQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00197

JSON explain

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