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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdd992bbf17f94b6c7e8f035de12e718f5ad1e74cfbd3d6faa18f389941d0bb' 
  AND token = 'rCA2rGCLFqnqFewPGUXqwE3VqL/PyC226VrAJLunsqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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