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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb200089061bfa55ef3f02a6005837acf685c9ac8ddc943c8a581f4140995ab' 
  AND token = 'Qdbq9BrLL0B8/srz4kCADwgIpByZ4GgAzRjYFlorNos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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