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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa8af8f63bbbd0a43be91757b603aba6f357c7eb3dcb0a371a0a7484bd34aba' 
  AND token = 'A5MQMO8utvxC5rWdg2O+RTWClS4HGK/+mabrYBS3gPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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