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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5831f9bf240d5135f5f5d1bb00930b6ba8098c720b9735192fa80fdb1f1ae1' 
  AND token = 'IVStvjs2oo7jMVMjFl1kVwyhgerhwK0090wLryqC8YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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